someone sent this to me in 10th grade once. i kept screwing up on the last level and was getting all concentrated to do it, and then i was finally at the end, thinking "awww shit yeah", when BAM! I uncontrollably screamed and couldn't stop shaking, and my parents thought i was electrocuted or something. worst part is, i couldn't talk for a good 30 seconds afterwards.

i told my dad to do it since i was to scared, and while i was looking over his shouder, it happened. i fell to he floor immediatly, screaming "turn it off, turn it off!!!!!!!!!!!!!!!!!!!!!!!!!!". I've been pranked with a similar "where's waldo" puzzle.